NOBUGS 2004 Conference

New Opportunities for Better User Group Software

October, 18-20, 2004 at PSI, Switzerland

Abstract Submitted for NOBUGS2004

The "asyn" facility for EPICS drivers

Mark Rivers, Marty Kraimer, Eric Norum

"asyn" provides standard mechanisms for higher level EPICS software such as device support and State Notation Language Programs to communicate with device-specific drivers. Facilities provided include connection management, threads for asynchronous devices, trace/debugging control, standard interfaces and generic device support. While “asyn” began as an effort to unify the support for “asynchronous” devices (such as RS-232, IEEE-488, and Ethernet sockets), it has recently been extended to be equally useful for synchronous devices, such as VME or PCI register-based instruments. The “synApps” software widely used for synchrotron beamline control and data acquisition is being converted to use asyn. The benefits we have realized include: - Significant reduction in the number of source files and lines of code - Better trace and debugging control - Large increase in the number of supported devices, since RS-232, GPIB and Ethernet devices are now all equivalent. - Code which used to be device-specific (for example fast feedback with the EPID record) is now device independent, provided only that a driver which implements the standard asyn interfaces is available.

Abstract File: abstract00151.txt


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